JP5672768B2 - Acoustic structure and articulator - Google Patents

Description

  The present invention relates to a technique for preventing acoustic disturbance in an acoustic space.

  In an acoustic space surrounded by walls such as a hall and a theater, acoustic obstacles such as booming and flutter echo occur due to repeated reflection of sound between parallel facing walls. Patent Document 1 discloses a technique suitable for preventing this type of acoustic disturbance. The acoustic structure disclosed in this document is used by being installed on the inner wall or ceiling of an acoustic space. The acoustic structure disclosed in this document has a plurality of rectangular pipes arranged in parallel so as to form a plane as a whole. Each of these pipes has an opening in the same direction. And an acoustic structure is installed in the inner wall, ceiling, etc. of acoustic space in the state which orient | assigned the opening part of each pipe to the center of acoustic space.

  Sound generated in the acoustic space is incident on each internal cavity through the opening of each pipe of the acoustic structure. The sound incident on the cavities of the pipes generates a standing wave corresponding to the resonance frequency of the pipes. Standing waves generated in the cavities of the pipes are radiated from the openings of the pipes toward the acoustic space. Then, the sound wave absorption effect and the scattering effect of the standing wave prevent the occurrence of acoustic disturbance in the acoustic space.

JP 2002-30744 A

By the way, the user of this type of acoustic structure installs the acoustic structure in the acoustic space only when he / she plays in the acoustic space, and stores the acoustic structure in another place otherwise. Sometimes you want to. However, since the acoustic structure disclosed in Patent Document 1 has a large volume, it is not easy to transport from the installation location to the storage location, and a large space is required for the storage.
The present invention has been devised under such a background, and an object thereof is to provide an acoustic structure excellent in portability and storage.

The present invention is a hollow four that is surrounded by four side surfaces and two bottom surfaces respectively interposed between the sides of the two opposite side surfaces of the four side surfaces and extends in the direction between the two bottom surfaces. A square pillar is formed, and one of the four side faces has an opening, and two side faces excluding the side face provided with the opening and the side face facing the side face are formed of the square pillar. The folds are parallel to the extending direction, and the two bottom surfaces each have a fold forming one plane that is the same as the fold, and the two side surfaces and the two bottom surfaces are folded at the respective folds. Thus, an acoustic structure is provided in which the side surface provided with the opening and the side surface facing the side surface are folded close to each other.
According to the present invention, since the acoustic structure can be folded along the fold line, a plurality of acoustic structures folded into a plate shape can be transported or stored in a narrow space. It becomes easy.

It is the perspective view and top view of the acoustic structure which are 1st Embodiment of this invention. It is sectional drawing when an acoustic structure is cut | disconnected by the cutting line AA of FIG. 1 (A). It is a figure which shows the behavior of a reflected wave when the incident wave of the frequency band containing the resonant frequencies fan and fbn of a closed tube enters into a side plate from the incident direction orthogonal to the side plate of the same acoustic structure. It is a perspective view of the sound control apparatus which is 2nd Embodiment of this invention. It is a perspective view of the sound control apparatus which is 3rd Embodiment of this invention. It is a right view of the acoustic structure of a tuning sound apparatus. It is a right view of the acoustic structure of the articulator which is other embodiment of this invention. It is a right view of the acoustic structure of the articulator which is other embodiment of this invention. It is a right view of the acoustic structure of the articulator which is other embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
<First Embodiment>
1A and 1B are perspective views showing the configuration of an acoustic structure 10 according to the first embodiment of the present invention. As shown in FIG. 1A, the acoustic structure 10 is surrounded by four side plates 12, 14, 13 and 15 and two bottom plates 16 and 17, and in the direction between the bottom plates 16 and 17. It is a hollow square column that extends. Here, of the four side plates 12, 14, 13 and 15, the side plate 12 has an opening 11.

  The side plates 14 and 15 excluding the side plate 12 having the opening 11 and the side plate 13 facing the side plate 12, 14, 13 and 15 are folded parallel to the extending direction of the quadrangular prism. It has eyes xa1 and xa2. Further, the side plate 14 and the side plate 15 face each other. Further, the bottom plates 16 and 17 have folds ya1 and ya2 that form the same plane as the folds xa1 and xa2 of the side plates 14 and 15, respectively.

  As shown in FIG. 1B, the acoustic structure 10 is bent while the side plates 14 and 15 are bent at the respective folds xa1 and xa2 and the bottom plates 16 and 17 are bent at the respective folds ya1 and ya2. The side plates 12 and 13 can be brought close to each other and folded so as to form a flat plate shape as a whole. FIG. 1C is a plan view of the acoustic structure 10 folded into a flat plate shape as viewed from the side plate 12 side.

  Further, films 20, 21, 22, and 23 are interposed between the bottom plates 16 and 17 and the side plates 14 and 15, respectively. When the side plates 14 and 15 and the bottom plates 16 and 17 are bent at the respective folds and the distance between the bottom plates 16 and 17 and the side plates 14 and 15 is changed, the films 20, 21, 22 and 23 are deformed.

  The side plates 12, 14, 13, and 15 and the bottom plates 16 and 17 are required to be materials that reflect sound. On the other hand, the acoustic structure 10 according to the present embodiment must be foldable as shown in FIG. 1 (C) or returned to an unfolded state as shown in FIG. 1 (A). Therefore, in the acoustic structure 10, the angle between the adjacent plates (for example, the side plates 12 and 14) adjacent to each other with the ridgeline as a boundary must be freely changeable.

  The side plates 14 and 15 must be able to bend at the respective folds xa1 and xa2, and the bottom plates 16 and 17 must be able to bend at the respective folds ya1 and ya2. Various configurations are conceivable for enabling such a flexible angle adjustment between the plates and folding at the fold while realizing sound reflectivity on the plate surface. For example, the following configurations are possible. May be adopted. That is, acrylic resin, etc., avoiding ridges and crease areas on a quadrangular prism shell made of an airtight material (for example, a stretchable film) that can be bent freely. It is the structure which affixed the reflective board | plate material of a material with high rigidity.

  The details of the configuration of the acoustic structure 10 have been described above. The user directs the opening 11 of the acoustic structure 10 in the state shown in FIG. 1A to the center of the acoustic space, and fixes the side plate 13 to the wall or ceiling in the acoustic space. The acoustic structure 10 provided in the acoustic space in this way generates a sound absorption effect and a scattering effect, and dissipates the acoustic energy of the sound wave propagated from the acoustic space toward the acoustic structure 10. The principle of generation of the sound absorption effect and the scattering effect by the acoustic structure 10 is as follows.

  FIG. 2 is a cross-sectional view of the acoustic structure 10 taken along the cutting line AA in FIG. As shown in FIG. 2, in the cavity behind the opening 11 in the acoustic structure 10, an acoustic tube 25 having the opening 11 as an opening end and a left end of the cavity as a closing end, and the opening 11 are opened. It can be considered that the acoustic tube 26 having an end and a closed end on the right end of the cavity is formed. When sound waves enter the cavity through the opening 11 from the acoustic space, a traveling wave traveling from the opening end (opening 11) of the acoustic tube 25 toward the closed end (the left end of the cavity) and the acoustic are generated in the cavity. A traveling wave is generated from the open end (opening 11) of the tube 26 toward the closed end (right end of the cavity). Then, the former traveling wave is reflected at the closed end of the acoustic tube 25, and the reflected wave returns to the opening 11. The latter traveling wave is reflected at the closed end of the acoustic tube 26, and the reflected wave returns to the opening 11.

Then, in the acoustic tube 25, resonance occurs at the resonance frequency fa _n (n = 1, 2,...) Shown in the following formula (1), and the sound wave obtained by synthesizing the traveling wave and the reflected wave in the acoustic tube 25 is The acoustic tube 25 has a particle velocity node at the closed end, and a standing wave having a particle velocity antinode at the open end. Further, in the acoustic tube 26, resonance occurs at the resonance frequency fb _n (n = 1, 2,...) Shown in the following formula (2), and a sound wave obtained by synthesizing the traveling wave and the reflected wave in the acoustic tube 26 is A standing wave having a particle velocity node at the closed end of the acoustic tube 26 and an antinode of particle velocity at the open end is obtained. In the following formulas (1) and (2), La is the length in the extending direction of the acoustic tube 25 (the length from the left end of the cavity to the opening 11), and Lb is the extending of the acoustic tube 26. The length in the direction (the length from the right end of the cavity to the opening 11), c is the propagation speed of the sound wave, and n is an integer of 1 or more.
fa _n = (2n−1) · (c / (4 · La)) (n = 1, 2...) (1)
fb _n = (2n−1) · (c / (4 · Lb)) (n = 1, 2...) (2)

Here, focusing on the components of the resonance frequency fa _n of sound waves incident from the acoustic space in the vicinity of the opening 11 at the opening 11 and the side plate 12, the acoustic is reflected at the closed end of the acoustic tube 25 from the opening 11 The sound wave radiated to the space becomes a sound wave having a phase opposite to that of the sound wave incident on the opening 11 from the acoustic space. On the other hand, in the vicinity of the opening 11 in the side plate 12, the incident wave from the acoustic space is reflected without any phase rotation.

Therefore, as shown in FIG. 3, when a sound wave including a component of the resonance frequency fa _n (n = 1, 2,...) Is incident on the cavity through the opening 11, the incident direction (see FIG. 3), the sound wave radiated from the acoustic tube 25 through the opening 11 and the sound wave reflected from each point in the vicinity of the opening 11 in the side plate 12 are in opposite phases and The phases interfere with each other, producing a sound absorption effect. In the scattering region where the sound wave from the opening 11 and the reflected wave from the side plate 12 are adjacent to each other, the phases of the sound wave from the opening 11 and the reflected wave from the side plate 12 are discontinuous. When waves having such a phase difference are adjacent to each other, a gas molecule flow is generated in the vicinity of the scattering region so as to eliminate the phase discontinuity. As a result, in the vicinity of the scattering region, acoustic energy flows in a direction other than the specular reflection direction with respect to the incident direction, and a scattering effect occurs. Similarly, when a sound wave including a component of the resonance frequency fb _n (n = 1, 2,...) Is incident on the cavity through the opening 11, the direction of specular reflection in the direction of incidence on the opening 11 (in FIG. 3). For the sound absorption region), a sound absorption effect occurs. In addition, a scattering effect occurs near the scattering region.

In the frequency band of each vicinity of the resonance frequency fa _n and fb _n, even deviated from the resonant frequency fa _n or fb _n, the closer the frequency it is to some extent, is radiated from the opening portion 11 in an acoustic space wave And the phase of the reflected wave radiated from the side plate 12 to the acoustic space are in a relation close to the opposite phase. Therefore, in the frequency band of each vicinity of the resonance frequency fa _n and fb _n, sound absorbing effect and scattering effect of degree depending on the proximity of the frequency to the resonant frequency fa _n or fb _n occurs.

  The above is the principle of the sound absorption effect and the scattering effect. In this embodiment, the side plates 14 and 15 of the acoustic structure 10 are bent at the respective folds xa1 and xa2, and the side plates 12 and 13 are bent while the bottom portions 16 and 17 are bent at the respective folds ya1 and ya2. Can be folded to form a flat plate shape as a whole. Therefore, it becomes easy to stack and transport a plurality of acoustic structures 10 each of which is bent flat, or to store them in a small space. As a result, space saving and cost reduction in transportation, storage, distribution, disposal, etc. are realized. In the acoustic structure 10, stretchable films 20, 21, 22, and 23 are interposed between the bottom plates 16 and 17 and the side plates 14 and 15, respectively. Therefore, when it is made into the state which is not folded (FIG. 1 (A)), sufficient airtightness can be given between each surface 16, 17, 14, 15 which mutually contacts. As a result, closed tubes 25 and 26 that are hermetically sealed at portions other than the opening 11 are formed. Therefore, a large sound absorption effect and scattering effect can be obtained.

Second Embodiment
FIG. 4 is a perspective view showing a configuration of a sound control device 30 according to the second embodiment of the present invention. In this articulator 30, three acoustic structures 10-1, 10-2, 10-3 are arranged in parallel with their extending directions parallel to each other, and adjacent folds xa1 and xa2 are connected to each other. It is. More specifically, in the sound control device 30, the fold xa1 of the acoustic structure 10-1 and the fold xa2 of the acoustic structure 10-2 are connected by the hinges 31 and 32. -2 fold line xa1 and fold line xa2 of acoustic structure 10-3 are connected by hinges 33 and 34.

Then, in the articulation device 30, the openings 11-1 in the side plate 12-1 of the acoustic structure 10-1 is provided spaced a distance _{L 1A} from one of the bottom plate 16-1, acoustics The opening 11-2 in the side plate 12-2 of the body 10-2 is provided at a position separated from the bottom plate 16-2 on the same side as the bottom 16-1 by a distance L _2A (L _2A ≠ L _1A ). The opening 11-3 in the side plate 12-3 of the acoustic structure 10-3 is separated from the bottom plate 16-3 on the same side as the bottom surface 16-1 by a distance L _3A (L _3A ≠ L _1A ≠ L _2A ). In the position.

In the sound control device 30, the acoustic structures 10-1, 10-2, and 10-3 can be folded into a plate shape or returned to their original state while being connected to each other. Further, in the sound control device 30, the openings 11-1, 11-2, 11- from the bottom plates 16-1, 16-2, 16-3 of the acoustic structures 10-1, 10-2, 10-3. The distances L _1A , L _2A and L _{3A up} to ₃ are different. Therefore, the resonance frequency of the closed tube formed inside each of the acoustic structures 10-1, 10-2, 10-3 is different. Therefore, a sound absorption effect and a scattering effect can be achieved in a wider frequency band than the acoustic structure 10 of the first embodiment.

<Third Embodiment>
FIG. 5 is a perspective view showing a configuration of a sound control device 30A according to the third embodiment of the present invention. This sound control device 30A includes an acoustic structure 50 and a pair of caps 80L and 80R or 81L and 81R. As shown in FIG. 5, the acoustic structure 50 of the articulator 30 </ b> A is surrounded by four side plates 54, 55, 56 and 57, and forms a hollow quadrangular column extending in one direction. Of the four side plates 54, 55, 56 and 57, the side plate 54 is the side plate 12-1, 12-2, 12- of the acoustic structure 10-1, 10-2, 10-3 (FIG. 4). 3 is connected to form a single plate. The size of the side plate 55 facing the side plate 54 is the same as the size of the side plate 54. Between the side plate 56 and the side plate 57, partition plates 58 and 59 for partitioning the inside of the rectangular column surrounded by both the plates 56 and 57 and the side plates 54 and 55 into three hollow rectangular columns are arranged. . In this acoustic structure 50, the side plates 54 and 55 and the other four plates 56, 57, 58, 59 are joined at the respective folds xc1, xc2, xc3, xc4, xc5, xc6. They are joined so as to be xc7 and xc8. There are various conceivable modes of joining at which the joining site becomes a crease. For example, the end portions of the side plates 56 and 57 and the partition plates 58 and 59 are joined portions 561, 562, 571, 572, 581, 582, 591, 592, and the joined portions 561, 562, 571, 572, 581. 582, 591 and 592 may be bent and joined to the surfaces of the side plates 54 and 55.

  More specifically, as shown in the right side view of FIG. 6A, the joint portions 561 and 562 of the side plate 56 are bent inward, and the bent joint portions 561 and 562 are inside the side plates 54 and 55. It is joined in the vicinity of one end of the surface. Similarly, the joint portions 571 and 572 of the side plate 57 are bent inward, and the bent joint portions 571 and 572 are joined in the vicinity of the other end of the inner surfaces of the side plates 54 and 55.

  Also, the joint portions 581 and 582 of the side plate 58 are bent in opposite directions, and the bent joint portions 581 and 582 are joined to a portion d on the inner side by a distance d from one end of the inner surface of the side plates 54 and 55. Yes. This distance d is 1/3 of the distance between the side plate 56 and the side plate 57. The joint portions 591 and 592 of the side plate 59 are bent in opposite directions, and the bent joint portions 591 and 592 are joined to the inner side by a distance d from the other end of the inner surfaces of the side plates 54 and 55.

  Each of the caps 80 </ b> L and 80 </ b> R is obtained by raising a thin edge plate 84 from four sides of a rectangular fitting face plate 83. Each of the caps 81 </ b> L and 81 </ b> R is obtained by raising a thin edge plate 86 from four sides of the fitting face plate 85 having a parallelogram shape. The fitting face plate 83 of each of the caps 80L and 80R is 90 degrees at each of the two pairs of diagonals, whereas the fitting face plate 85 of each of the caps 81L and 81R has a diagonal angle of 120 degrees. The other diagonal angle is 60 degrees.

  The end portions on both sides in the extending direction of the side plates 54, 55, 56, 57 and the partition plates 58, 59 in the acoustic structure 50 are surrounded by the plates 54, 55, 56, 57, 58, 59. Open surfaces 60, 61, 62 communicating with the inside of the prism are configured. When the user uses the acoustic structure 50 in the acoustic space, the cap 80L, 80R or the cap 81L, 81R is fixed to the open surfaces 60, 61, 62 on both sides in the extending direction. When the caps 80L, 80R are fixed to the open surfaces 60, 61, 62 of the acoustic structure 50, the open surfaces 60, 61, 62 of the acoustic structure 50 are blocked by the fitting face plates 83 of the caps 80L, 80R. An acoustic tube surrounded by the plates 54, 55, 56, 57, 58, 59 and the fitting face plates 83 of the caps 80L, 80R is formed in the acoustic structure 50. Further, when the caps 81L, 81R are fixed to the open surfaces 60, 61, 62 of the acoustic structure 50, the open surfaces 60, 61, 62 of the acoustic structure 50 are closed by the fitting face plate 85 of the caps 81L, 81R. The acoustic tube surrounded by the plates 54, 55, 56, 57, 58 and 59 and the fitting face plate 85 of the caps 81 </ b> L and 81 </ b> R is formed in the acoustic structure 50. When the caps 80L, 80R are fixed to the open surfaces 60, 61, 62 of the acoustic structure 50, the acoustic structure 50 includes the side plates 54, 55 and the side plates as shown in the right side view of FIG. The positions 56 and 57 and the partition plates 58 and 59 are orthogonal to each other. When the caps 81L and 81R are fixed to the open surfaces 60, 61 and 62 of the acoustic structure 50, the acoustic structure 50 is attached to the side plates 54 and 55 as shown in the right side view of FIG. On the other hand, the side plates 56 and 57 and the partition plates 58 and 59 are inclined.

  When the user has finished using the acoustic structure 50 in the acoustic space, the user removes the caps 80L, 80R or 81L, 81R fixed to the open surfaces 60, 61, 62. Thereafter, as shown in the right side view of FIG. 6C, the side plates 54 and 55 are brought close to each other while the acoustic structure 50 is bent at the folds xc1, xc2, xc3, xc4, xc5, xc6, xc7, xc8. And can be folded so as to form a flat plate shape as a whole.

  In the sound control device 30A, the side plates 54 and 55, the side plates 56 and 57, the partition plates 58 and 59, and the partition plates 58 and 59 are changed by changing the types of the caps 80 and 81 fixed to the open surfaces 60, 61, and 62 of the acoustic structure 50. The articulator 30A can be used in two postures: a posture in which the side plates 56 and 57 and the partition plates 58 and 59 are inclined with respect to the side plates 54 and 55. Therefore, the caps 81L and 81R are fixed when installed in a narrow place where the side plate 54 and the side plate 55 need to be thinned, and otherwise the caps 80L and 80R are fixed. It can be used in a posture suitable for the width of the installation location of the articulator 30A in the acoustic space.

  In addition, since the size of the cross-sectional area of the space in the acoustic structure 50 is different between the case where the caps 80L and 80R are fixed and the case where the caps 81L and 81R are fixed, the magnitude of the sound absorption effect and the scattering effect is about the level of the cap. The case where 80L and 80R are fixed differs from the case where caps 81L and 81R are fixed. Therefore, in the present embodiment, the magnitude of the acoustic effect and the scattering effect can be changed by changing the types of caps 80L and 80R and 81L and 81R to be used.

Although one embodiment of the present invention has been described above, the present invention may have other embodiments. For example, it is as follows.
(1) In the first embodiment, the acoustic structure 10 has a rectangular parallelepiped shape. However, the acoustic structure 10 may have a triangular prism shape. In this case, of the three side plates surrounding the shaft, one side plate is provided with a fold parallel to the extending direction, and the side plate provided with the fold is folded into a mountain fold or a valley fold at the fold. It is good to constitute so that

(2) In the second embodiment, the fold xa1 of the acoustic structure 10-1 and the fold xa2 of the acoustic structure 10-2 constituting the sound control device 30 are connected by the hinges 31 and 32, and the acoustic structure 10- The second fold line xa1 and the fold line xa2 of the acoustic structure 10-3 were connected by the hinges 33 and 34. However, each fold line xa1 and fold line xa2 may be abutted and a cloth coated with an adhesive may be applied to the abutting position in that state.

(3) In the third embodiment, the folds xd1, xd2, xd3, and xd4 may be provided on the side plates 56 and 57 and the partition plates 58 and 59 themselves in the acoustic structure 50 of the sound control device 30A. In this embodiment, as shown in the side view of FIG. 7A, the side plates 56 and 57 and the partition plates 58 and 59 are raised without being bent when the sound adjusting device 30A is used in the acoustic space. . Then, as shown in the side view of FIG. 7B, when the use of the articulation device 30A in the acoustic space is finished, the side plates 56 and 57 and the partition plates 58 and 59 are folded at the folds xd1, xd2, and the like. In xd3 and xd4, it is bent into a square shape to form a flat plate.

(4) In the first and second embodiments, the bottom plates 16 and 17 and the films 20, 21, 22, and 23 are eliminated, and the tubes are opened in the acoustic structures 10, 10-1, 10-2, and 10-3. It is good also as a structure that is formed.

(5) In the second embodiment, adjacent folds xa1 and xa2 in the three acoustic structures 10-1, 10-2, and 10-3 are connected by hinges 31 and 32 and hinges 33 and 34, respectively. It was. However, you may connect parts other than the folds xa1 and xa2 in the adjacent acoustic structures 10-1, 10-2, and 10-3. FIG. 8 is a right side view of the articulator 30B as the first example of this embodiment. FIG. 9 is a right side view of an articulator 30C, which is a second example of this embodiment.

  As shown in FIG. 8, the articulator 30B includes four acoustic structures 60-1, 60-2, 60-3, and 60-4. Each of the acoustic structures 60-1, 60-2, 60-3, 60-4 is surrounded by four side plates 61, 62, 63, 64 and has a hollow quadrangular prism shape extending in one direction. There is no. Of the four side plates 61, 62, 63, 64, the side plate 61 is provided with an opening (not shown). Further, in each of the acoustic structures 60-1, 60-2, 60-3, 60-4, the side plates 61 and 62 and the side plates 63 and 64 that face each other are formed so that the joint portions thereof are folds. It is joined. In the sound control device 30B, a fold that is a joint portion between the side plate 61 and the side plate 64 in the acoustic structure 60-1, and a fold that is a joint portion between the side plate 62 and the side plate 63 in the acoustic structure 60-2. Are connected by a hinge 70. In addition, a fold that is a joint portion between the side plate 61 and the side plate 64 in the acoustic structure 60-2 and a fold that is a joint portion between the side plate 62 and the side plate 63 in the acoustic structure 60-3 are connected by the hinge 71. It is connected. In addition, a fold that is a joint portion between the side plate 61 and the side plate 64 in the acoustic structure 60-3 and a fold that is a joint portion between the side plate 62 and the side plate 63 in the acoustic structure 60-4 are connected by the hinge 72. It is connected. The sound control device 30B can be folded so as to form a flat plate as a whole by bending the acoustic structures 60-1, 60-2, 60-3, 60-4 in the direction of the arrows shown in FIG. it can.

  As shown in FIG. 9, the sound adjustment device 30C includes four acoustic structures 80-1, 80-2, 80-3, and 80-4. Each of the acoustic structures 80-1, 80-2, 80-3, 80-4 is surrounded by four side plates 81, 82, 83, 84, and has a hollow quadrangular prism shape extending in one direction. There is no. Of the four side plates 81, 82, 83, 84, the side plate 81 has an opening (not shown). Further, in each of the acoustic structures 80-1, 80-2, 80-3, 80-4, the side plates 81 and 83 and the side plates 82 and 84 that face each other are formed such that the joint portions thereof are folds. It is joined. In the sound control device 30C, a fold that is a joint portion between the side plate 84 and the side plate 82 in the acoustic structure 80-1, and a fold that is a joint portion between the side plate 82 and the side plate 83 in the acoustic structure 80-2. Are connected by a hinge 90. In addition, a fold that is a joint portion between the side plate 82 and the side plate 84 in the acoustic structure 80-2 and a fold that is a joint portion between the side plate 82 and the side plate 83 in the acoustic structure 80-3 are formed by the hinge 91. It is connected. In addition, a fold that is a joint portion between the side plate 82 and the side plate 84 in the acoustic structure 80-3 and a fold that is a joint portion between the side plate 82 and the side plate 84 in the acoustic structure 80-4 are formed by the hinge 92. It is connected. This sound control device 30C can be folded so as to form a flat plate as a whole by bending the acoustic structures 80-1, 80-2, 80-3, 80-4 in the direction of the arrows shown in FIG. it can.

(6) In the first embodiment, the side plates 14 and 15 are provided with the folds xa1 and xa2. However, a fold may be provided in the side plate 12 having the opening 11 and the side plate 13 facing the side plate 12.

10, 10-1, 10-2, 10-3 ... acoustic structure, 11, 11-1, 11-2, 11-3 ... opening, 12, 12-1, 12-2, 12-3, 13 , 14, 15, 54, 55, 56, 57 ... side plate, 16, 16-1, 16-2, 16-3, 17 ... bottom plate, 20, 21, 22, 23 ... film, 59, 60 ... partition Plate, 30, 30A ... articulator, 80, 80A ... cap.

Claims (2)

Surrounded by four side surfaces and two bottom surfaces respectively interposed between the sides of the two opposite side surfaces of the four side surfaces, forming a hollow quadrangular prism extending in the direction between the two bottom surfaces,
Any one of the four side surfaces has an opening, and the two side surfaces excluding the side surface provided with the opening and the side surface facing the side surface extend in the extending direction of the square pillar. There are parallel folds, the two bottom surfaces each have a fold that forms the same plane as the folds, and an elastic film is interposed between each of the four side surfaces and the two bottom surfaces. By maintaining the airtightness of the space surrounded by the four side surfaces and the two bottom surfaces,
An acoustic structure characterized in that the two side surfaces and the two bottom surfaces are folded at respective folds so that the side surface provided with the opening and the side surface opposite to the side surface are folded close to each other. . A sound control device comprising a plurality of the acoustic structures according to claim 1 , wherein the acoustic structures are arranged in parallel with each other extending in parallel, and adjacent acoustic structures are connected to each other.

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